Created attachment 21742[details]
Sample project
I am using the following configuration:
Default MasterDetailPage
- Master: MenuPage (some Label en some other views) based on ContentPage
- Detail: NavigationPage with BookingsPage (ListView) (based on ContentPage)
In the MenuPage I used a View to create a horizontal line, like this:
<View HorizontalOptions="FillAndExpand"
BackgroundColor="Black"
HeightRequest="1" />
After upgrading to 2.3.4 suddenly my ListView in the BookingsPage was not loading. I did a lot of investigation, and I found out that that View in the MenuPage was the problem. When I replaced the <View> with a <BoxView> it worked again! So I replaced the <View> with this:
<BoxView HorizontalOptions="FillAndExpand"
BackgroundColor="Black"
HeightRequest="1" />
I did not get any error, it was just not loading. When I displayed the BookingsPage as the Master, and the MenuPage inside the NavigationPage as the Detail, it was also working, so it looks like a combination of a <View> element that is used in the Master part of a MasterDetailPage.
You can reproduce this issue with the attached project. This project is the project that you get when you start a new Cross Platform project (PCL) with Visual Studio, so very basic stuff. In the AboutPage.xaml I added the <View> on line 47. When you leave this here, you will see that the ItemsPage will not load correctly, when you comment line 47, you will see that ItemsPage will load correctly.

I am also seeing this issue when I run the attached project on Android. The issue does not occur on iOS. I am confirming this report so the team can investigate further.
### Workaround
As mentioned in the description, using a BoxView instead of a View will resolve the issue.
### Regression Test
2.3.5-pre1 BAD
2.3.4.231 BAD
2.3.3.193 GOOD